Abstract
The market of lithium-ion batteries (LIBs) is growing explosively especially due to the wide application of electric vehicles. However, there are still safety concerns existing with EVs under thermal/electrochemical abuse conditions. Improving the safety of the battery without sacrificing battery performance is still a major industrial/scientific challenge. Herein, a shutdown functional high-density polyethylene (HDPE) wax@boehmite (γ-AlOOH, AO)/PE composite separator is proposed. The HDPE@AO coating layer could be preferentially melted and infuse to block the pores of PE matrix, which shuts down the lithium-ion transportation at about 130 °C, significantly improving the safety of the LIBs. Furthermore, it could also restrain self-discharge behavior and promote the long-term cycling performance. The HDPE wax@AO/PE separator, which could be easily mass produced, holds great promise for large scale application in electric vehicles and other fields.
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